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Probing Spin-Dependent Dark Matter Interactions with 6Li

European Physical Journal C(2022)SCI 2区

Max-Planck-Institut für Physik | INFN | Comenius University | Institut für Hochenergiephysik der Österreichischen Akademie der Wissenschaften | Technische Universität München | Eberhard-Karls-Universität Tübingen | University of Oxford

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Abstract
CRESST is one of the most prominent direct detection experiments for dark matter particles with sub-GeV/c ^2 mass. One of the advantages of the CRESST experiment is the possibility to include a large variety of nuclides in the target material used to probe dark matter interactions. In this work, we discuss in particular the interactions of dark matter particles with protons and neutrons of ^6 Li. This is now possible thanks to new calculations on nuclear matrix elements of this specific isotope of Li. To show the potential of using this particular nuclide for probing dark matter interactions, we used the data collected previously by a CRESST prototype based on LiAlO _2 and operated in an above ground test-facility at Max-Planck-Institut für Physik in Munich, Germany. In particular, the inclusion of ^6 Li in the limit calculation drastically improves the result obtained for spin-dependent interactions with neutrons in the whole mass range. The improvement is significant, greater than two order of magnitude for dark matter masses below 1 GeV/c ^2 , compared to the limit previously published with the same data.
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要点】:通过使用新的核矩阵元素计算,CRESST实验展示了使用$$^6$$Li核素探测暗物质相互作用的潜力,尤其对中子的自旋相关相互作用进行了改善。

方法】:通过新的核矩阵元素计算,结合之前在Max-Planck-Institut für Physik进行的CRESST原型实验数据。

实验】:在Max-Planck-Institut für Physik的地面测试设施中,使用LiAlO$$_2$$,并在整个质量范围内,$$^6$$Li的加入显著改善了与中子的自旋相关相互作用的结果,特别是在小于1 GeV/c$$_2$$的暗物质质量范围内,改善超过两个数量级。